i've a doubt about using Prolog for my grad school research. Recently, i've presented a small part of my research work which is discussed about logic and prolog in a conference. I got a comment from an audience that questioned me "why i chose prolog". He said that prolog is an outdated languages (popular usage around '80s) and people are rarely talk about prolog now. Is there any risk if i use prolog in my research study because of its old-fashioned language? or maybe i should prolog as only a part of my study. This is confusing me as i know that prolog is still be using in academia now..

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I'm sure that you've read a multitude of papers by researchers doing work in your field. What are they using? I don't know what you study, but if you know that it's the right tool for the task, and you've weighed costs/benefits against alternatives, then take what the critic said with a grain of salt.
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jonscaJul 17 '11 at 4:18

In academia the relationship of Prolog to mathematical logic is also of great interest. But one can do mathematical logic without a computer, just paper and pencil. To get an impression what is going on in mathematical logic one might like to visit: